@article{JRAM_1996__472_153799,
     author = {N. Arcozzi and F. Di Biase and R. Urbanke},
     title = {Approach regions for trees and the unit disc.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {157--176},
     publisher = {mathdoc},
     volume = {472},
     year = {1996},
     zbl = {0839.31012},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1996__472_153799/}
}